Audi is pulling out of the American Le Mans Series, ending a dominating nine-year run in which its cars won the LMP1 class championship every season. Audi will continue to race in the 24-hour race in Le Mans, France, and will also keep its cars in the German touring cars (DTM) series, as well in the 12-hour race in Sebring, Fla.

Audi has dominated the 24 Hours of Le Mans two years running with its powerful diesel prototype, but in the American Le Mans Series, it regularly runs second to Team Penske's Porsche Spyder. Both sides are fighting the rule book going into this weekend's Petit Le Mans at Road Atlanta.